中文摘要：

为研究系泊系统在定位过程中的势能变化，使用悬链线公式，推导了3种常见系泊方式系缆的构形及张力分布．分析了下端点固定的单根锚泊线的重力势能和弹性势能随上端点位置的变化情况，对比了势能间接求导所得的水平张力与直接计算所得的水平张力，发现两者吻合良好，符合能量守恒定律，验证了势能计算结果的准确性．针对系泊系统由9根复合缆组成的深水平台，分析了其系泊系统势能随浮体水平位置的变化情况，比较了各浪向上的位移与回复力关系，发现其系泊性能在各个浪向上接近，对环境适应能力强．针对系泊系统破损的工况，计算得到了系泊系统势能分布图以及各浪向上的位移与回复力关系，发现使用势能分布法能全面有效地反映系泊系统的各个方向性能，具有重要的工程参考价值．

英文摘要：

To understand the mooring energy during positioning, the configuration and tension of three types of mooring lines were derived using catenary formula. The gravitational and elastic potential energy distributions of a single mooring line with the lower end fixed were calculated for different upper end positions. The horizontal force calculated from potential energy was compared with that of calculation directly, and the results show good agreement, and satisfy the law of conservation of energy and also prove the cor- rectness of the results of potential energy. For a deep-water platform moored by nine composite mooring lines, the potential energy distributions of the mooring system were analyzed, and the offset-lateral force relations were compared in different directions. They are found to meet each other very well, which indicates a balanced performance of the mooring system. The potential energy distributions and the offset-lateral force relations in different wave directions were calculated for the damaged case. From the results, it can be found that the potential energy distribution can reflect the performance of the mooring system in all directions effectively, which has important practical value in ocean engineering.